Version:           2.1.0 (using KDE 4.6.4) 
OS:                Linux

When I middle-click on a folder in the folder pane of Kmail 1 a tab is opened which shows the content of the chosen folder. The tab is named like the folder.

When I do the same in Kmail too just a blank tab opens that also is called "blank" (Leer in German). The content of the chosen folder instead is shown in the first tab which nonetheless has the name of the folder I originally had in that tab. So tabbing is useless by now because actually only one tab is used in which the content gets "overwritten".

Reproducible: Always

Steps to Reproduce:
Make your Inbox the current folder. The middle click on e.g. drafts. Two tabs appear: A new blank one opens in the foreground and as first tab in the background you can see "inbox". Go the inbox tab - surprise - it shows the content of your drafts folder. 


Expected Results:  
Should behave the same as in KMail 1: middle click on a folder opens it in a new tab which also has the name of the chosen folder. The other tabs keep their content.